TROMSØ, Norway (Interstat) — Tromsø opened its Eliteserien season with a 1-0 victory over rival Rosenborg on Saturday at Romssa Arena. Ruben Jenssen scored the game’s only goal in the fourth minute, securing the win for the home side. The result was an upset, as statistical models heavily favored Rosenborg to win. The match was a physical affair, with five yellow cards issued by the officiating crew. With the loss, Rosenborg begins its league campaign 0-1, while Tromsø starts 1-0.